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yes
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You cannot make a brochure on Gmail. It is only a website for sending and receiving mails. You can make brochures on Word.
No, boosting a mobile cannot happen through Gmail. It is a normal sending and receiving mail system. It also manages the mails properly and cleanly.
Non-repudiation only refers to the fact that a sender of a message cannot deny they sent it; since the relationship of the public/private key pairs makes it impossible to deny if they sent a message.Non-repudiation cannot be used by either a sender or a receiver of a message to deny they ever received it; it only can be used if a message was received.
The Checks and Balances system.
A Network Interface Card (NIC) is needed to connect a computer to a network. It allows a computer to communicate with other devices on the network by sending and receiving data packets. Without a NIC, a computer cannot access network resources or connect to the internet.
You can't deny receiving or not receiving a message with non-repudiation; it only has to do with who the sender of the message was. Because there is a mathematical relationship between public and private keys, if a sender uses their private key to send a message and the receiver uses the sender's public key to read it, then non-repudiation says that the sender had to have sent that message, and no one else (because no one else has the key pair).
If someone is sending you messages on Facebook and you cannot reply, the reason is because the person has that certain settings on their account so that only people on their friends' list can message them.